<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			#d1{
				border-radius: 50%;
				height: 200px;
				width: 200px;
				background: linear-gradient(90deg,#000 100px,#1ff 100px);
			}
		</style>
	</head>
	<body>
		<div id="d1">
			2
		</div>
	</body>
</html>
